Trakanon's Gaze > INT Line final ability
I also have serious doubts as to whether +disruption does much of anything. When one grouping the x4 in KP the other day, it took us two pulls (group wiped at 4% /sigh, and even though I kited it in circles for 2 min min they didn't get back in time... slow pokes

). The first pull my ball of magma hit rate was about 80% (we had no bards). The second pull I put on my claymore hoping that the +69 disruption proc that is pretty much always up would help my hit rate, but sure enough my ball of magma hit rate was still about 80%. And this is against a yellow con x4.
I'm not sure exactly what they did to mage resist rate, but it seems very on or off. Either the mob is debuffed (I'm thinking wisdom debuffs here are the primary factor) and you hit 100% of the time, or the mob is not debuffed, and you hit 80% of the time. Unfortunately it doesn't look like disruption helps much.